Rainwater collection doesn’t have to be limited to the water flowing into your tank from the roof. Brad Lancaster shows that simple earthworks and smart planning can help you gather thousands more litres – and turn even the most barren desert into a lush oasis.

If you're serious about saving water for our challenge, you'll want to look into rainwater tanks and greywater systems for your garden and maybe even your home. It fits in neatly to our "Reduce, Reuse, Recycle" mantra for environmental living, because why should water only get used once?